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@ARTICLE{Kyriakos:187538,
author = {Kyriakos, Konstantinos and Aravopoulou, Dionysia and
Augsbach, Lukas and Sapper, Josef and Ottinger, Sarah and
Psylla, Christina and Aghebat Rafat, Ali and
Benitez-Montoya, Carlos Adrian and Miasnikova, Anna and Di,
Zhenyu and Laschewsky, André and Müller-Buschbaum, Peter
and Kyritsis, Apostolos and Papadakis, Christine M.},
title = {{N}ovel thermoresponsive block copolymers having different
architecturesâstructural, rheological, thermal, and
dielectric investigations},
journal = {Colloid $\&$ polymer science},
volume = {292},
number = {8},
issn = {1435-1536},
address = {Berlin},
publisher = {Springer},
reportid = {FZJ-2015-01167},
pages = {1757 - 1774},
year = {2014},
abstract = {Thermoresponsive block copolymers comprising long,
hydrophilic, nonionic poly(methoxy diethylene glycol
acrylate) (PMDEGA) blocks and short hydrophobic polystyrene
(PS) blocks are investigated in aqueous solution. Various
architectures, namely diblock, triblock, and starblock
copolymers are studied as well as a PMDEGA homopolymer as
reference, over a wide concentration range. For specific
characterization methods, polymers were labeled, either by
partial deuteration (for neutron scattering studies) or by
fluorophores. Using fluorescence correlation spectroscopy,
critical micellization concentrations are identified and the
hydrodynamic radii of the micelles, r h mic , are
determined. Using dynamic light scattering, the behavior of
r h mic in dependence on temperature and the cloud points
are measured. Small-angle neutron scattering enabled the
detailed structural investigation of the micelles and their
aggregates below and above the cloud point. Viscosity
measurements are carried out to determine the activation
energies in dependence on the molecular architecture.
Differential scanning calorimetry at high polymer
concentration reveals the glass transition of the polymers,
the fraction of uncrystallized water and effects of the
phase transition at the cloud point. Dielectric relaxation
spectroscopy shows that the polarization changes reversibly
at the cloud point, which reflects the formation of large
aggregates upon heating through the cloud point and their
redissolution upon cooling.},
cin = {JCNS (München) ; Jülich Centre for Neutron Science JCNS
(München) ; JCNS-FRM-II / Neutronenstreuung ; JCNS-1 /
ICS-1},
ddc = {540},
cid = {I:(DE-Juel1)JCNS-FRM-II-20110218 /
I:(DE-Juel1)JCNS-1-20110106 / I:(DE-Juel1)ICS-1-20110106},
pnm = {54G - JCNS (POF2-54G24)},
pid = {G:(DE-HGF)POF2-54G24},
experiment = {EXP:(DE-MLZ)KWS2-20140101},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000339888900004},
doi = {10.1007/s00396-014-3282-0},
url = {https://juser.fz-juelich.de/record/187538},
}